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Chap_11_HW_solutions

# Chap_11_HW_solutions - CHAPTER 11 HOMEWORK SOLUTIONS 26 An...

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CHAPTER 11 HOMEWORK SOLUTIONS 26. An aqueous antifreeze solution is 40.0% ethylene glycol (C 2 H 6 O 2 ) by mass. The density of the solution is 1.05 g/cm 3 . Calculate the molality, molarity and mole fraction of the ethylene glycol. 32. Calculate the molarity and mole fraction of acetone in a 1.00 m solution of acetone (CH 3 COCH 3 ) in ethanol (C 2 H 5 OH). (Density of acetone = 0.788 g/cm 3 ; density of ethanol = 0.789 g/cm 3 .) Assume that the volumes of acetone and ethanol add.

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46. The vapor pressure of a solution containing 53.6 g of glycerin (C 3 H 8 O 3 ) in 133.7 g of ethanol (C 2 H 5 OH) is 113 torr at 40 o C. Calculate the vapor pressure of pure ethanol at 40 o C assuming that glycerin is a nonvolatile, nonelectrolyte solute in ethanol. 50. A solution is prepared by mixing 0.0300 mol CH 2 Cl 2 and 0.0500 mol CH 2 Br 2 at 25 o C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25 o C. At 25 o C, the vapor pressure of pure CH 2 Cl 2 and pure CH 2 Br 2 are 133 ad 11.4 torr, respectively.